JEE-MAIN SERIES Chemistry
Thermochemistry
7 previous year questions.
Volume: 7 Ques
Yield: Medium
High-Yield Trend
4
2026 2
2025 1
2023 Chapter Questions 7 MCQs
01
PYQ 2023
easy
chemistry ID: jee-main
Solid fuel used in rocket is a mixture of Fe₂O₃ and Al (in ratio 1 : 2) the heat evolved (KJ) per gram of the mixture is ______ (Nearest integer)
Given
}
Given
}
02
PYQ 2025
medium
chemistry ID: jee-main
Total enthalpy change for freezing of 1 mol water at 10°C to ice at -10°C is ______ (Given: , , and )
1
2
3
4
03
PYQ 2025
medium
chemistry ID: jee-main
Consider the following data: - Heat of formation of = -393.5 kJ mol
- Heat of formation of = -286.0 kJ mol
- Heat of combustion of benzene = -3267.0 kJ mol The heat of formation of benzene is ________________________ kJ mol (Nearest integer).
04
PYQ 2026
medium
chemistry ID: jee-main
Gas ‘A’ undergoes change from state ‘X’ to state ‘Y’. In this process, the heat absorbed and work done by the gas is 10 J and 18 J respectively. Now gas is brought back to state ‘X’ by another process during which 6 J of heat is evolved. In the reverse process of ‘Y’ to ‘X’, the work done is:
1
18 J of the work is done by the gas ‘A’.
2
2 J of the work is done by the gas ‘A’.
3
12 J of the work is done on the gas ‘A’ by the surrounding.
4
14 J of the work is done on the gas ‘A’ by the surrounding.
05
PYQ 2026
medium
chemistry ID: jee-main
Consider the following equations: (i)
(ii)
(iii)
(iv)
The enthalpy of formation of anhydrous solid is:
1
kJ mol
2
kJ mol
3
kJ mol
4
kJ mol
06
PYQ 2026
hard
chemistry ID: jee-main
If the enthalpy of sublimation of Li is , enthalpy of dissociation of is , ionization enthalpy of Li is , electron gain enthalpy of F is , and standard enthalpy of formation of LiF is , then the magnitude of lattice enthalpy of LiF is ____________ kJ mol (Nearest integer).
07
PYQ 2026
medium
chemistry ID: jee-main
Consider the following data :
Enthalpy of sublimation of graphite
Dissociation enthalpy of
The bond enthalpy of C-H bond is given by :}
Enthalpy of sublimation of graphite
Dissociation enthalpy of
The bond enthalpy of C-H bond is given by :}
1
2
3
4
About Thermochemistry - JEE-MAIN
Thermochemistry is a vital chapter for JEE-MAIN aspirants. Mastering the concepts covered in this chapter is essential for securing a top rank.
By rigorously practicing the previous year questions associated with this chapter, you can identify high-yield topics, understand the examiner's perspective, and boost your confidence during the actual exam.
Frequently Asked Questions
Why focus on Thermochemistry PYQs?
Analyzing PYQs for this specific chapter reveals the most frequently tested concepts and the typical complexity of questions, allowing you to tailor your study plan efficiently.
How to best use this analysis?
Review the topic breakdown to see which sub-topics within Thermochemistry carry the most weight. Then, tackle the questions iteratively to solidify your understanding.